backend/winhttp: init

[bdbai]

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[Copilot]

Pull request overview

Introduces a new Windows WinHTTP backend (nyquest-backend-winhttp) and integrates it into the backend test suite and CI matrix so it can be exercised alongside existing backends.

Changes:

• Add the new nyquest-backend-winhttp crate with blocking/async + (optional) streaming + multipart support.
• Wire the WinHTTP backend into nyquest-backend-tests (feature flags + backend registration) and expand fixtures/expectations.
• Extend GitHub Actions workflows to run backend tests for WinHTTP on Windows.

Reviewed changes

Copilot reviewed 37 out of 38 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
nyquest-backend-tests/src/lib.rs	Registers the new winhttp backend feature and adjusts server error logging.
nyquest-backend-tests/src/fixtures/scenarios/early_drop.rs	Adds an early-drop client scenario test.
nyquest-backend-tests/src/fixtures/scenarios/chunked_encoding.rs	Refactors builder setup for blocking/async paths.
nyquest-backend-tests/src/fixtures/scenarios.rs	Includes the new early_drop scenario module.
nyquest-backend-tests/src/fixtures/responses.rs	Expands get_header fixture to cover repeated header values and platform differences.
nyquest-backend-tests/src/fixtures/client_options/request_timeout.rs	Makes timeout fixture delays configurable and adds elapsed-time assertions.
nyquest-backend-tests/src/fixtures/client_options/cache.rs	Excludes WinHTTP from caching tests.
nyquest-backend-tests/Cargo.toml	Adds winhttp feature wiring and optional dependency on nyquest-backend-winhttp.
backends/winhttp/src/url.rs	Adds URL concatenation/parsing utilities for WinHTTP.
backends/winhttp/src/stream/writer.rs	Implements streaming upload buffer/chunk handling.
backends/winhttp/src/stream/dummy_writer.rs	Provides a stub writer when stream features are disabled.
backends/winhttp/src/stream.rs	Defines shared stream upload types and conditional writer module selection.
backends/winhttp/src/session.rs	Implements WinHTTP session creation and option configuration.
backends/winhttp/src/request.rs	Implements request construction, header/body preparation, and WinHTTP handle creation.
backends/winhttp/src/multipart.rs	Implements multipart body generation (bytes + stream parts).
backends/winhttp/src/lib.rs	Defines the WinHTTP backend crate entry points and feature-gated modules.
backends/winhttp/src/handle/session.rs	Wraps WinHTTP session handles and session-level options.
backends/winhttp/src/handle/request.rs	Wraps WinHTTP request handles and request operations (send/read/write/header queries).
backends/winhttp/src/handle/connection.rs	Wraps WinHTTP connection handles.
backends/winhttp/src/handle.rs	Exposes the WinHTTP handle wrapper modules.
backends/winhttp/src/error.rs	Defines WinHTTP-specific error mapping into nyquest errors.
backends/winhttp/src/blocking/response.rs	Implements blocking response reading and header access.
backends/winhttp/src/blocking/client.rs	Implements blocking client request execution and optional streaming upload.
backends/winhttp/src/blocking.rs	Declares blocking client/response modules.
backends/winhttp/src/async/threadpool.rs	Adds Win32 threadpool submission for async setup work.
backends/winhttp/src/async/state_fut.rs	Adds a small Future helper to await state transitions.
backends/winhttp/src/async/response.rs	Implements async response reading, including optional AsyncRead.
backends/winhttp/src/async/context.rs	Defines shared async request context/state for callbacks + futures.
backends/winhttp/src/async/client.rs	Implements async client request execution and optional streaming upload.
backends/winhttp/src/async/callback.rs	Implements WinHTTP status callback and state transitions.
backends/winhttp/src/async.rs	Declares async submodules.
backends/winhttp/README.md	Adds documentation for the new backend crate and its features.
backends/winhttp/Cargo.toml	Adds the new backend crate manifest, features, and dependencies.
Cargo.lock	Records new crate/dependency entries for the WinHTTP backend and transitive deps.
.github/workflows/backend-tests-blocking.yml	Adds a Windows WinHTTP job for blocking backend tests.
.github/workflows/backend-tests-blocking-stream.yml	Adds a Windows WinHTTP job for blocking-stream backend tests.
.github/workflows/backend-tests-async.yml	Adds a Windows WinHTTP job for async backend tests.
.github/workflows/backend-tests-async-stream.yml	Adds a Windows WinHTTP job for async-stream backend tests.

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Pull request overview

Copilot reviewed 38 out of 39 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 38 out of 39 changed files in this pull request and generated 5 comments.

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[Copilot]

Pull request overview

Copilot reviewed 38 out of 39 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 39 out of 40 changed files in this pull request and generated 2 comments.

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